("Enterprise Network Construction and Use (Second Edition)" is divided into four parts: network, Windows, Linux, and test question analysis and simulation questions. The first three use a project-by-project approach, which is explained by the way of mission, and the fourth is a technical competition. The test questions were analyzed and two sets of mock questions were provided. In this way, readers can grasp more useful technologies and methods in a short period of time, and rapidly improve the level of technical competition.)